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Efeitos Ambientais sobre Ganho de Peso no Período do Nascimento ao Desmame em Bovinos da Raça Nelore
(Revista Brasileira de Zootecnia, 1999-01-01) [Artigo]
The objective of this work was to study the effects of age of dam (AOD), age of calf (AOC) and Julian date of birth (DOB) on the average daily gain (ADG) from birth to weaning period of Nellore breed animals. The data were ...
Variance heterogeneity for milk yield in Brazilian and Colombian Holstein herds
(Livestock Research for Rural Development, 2004-04-01) [Artigo]
Heterogeneity of variances for milk yield (MY) was determined for Brazilian and Colombian herds. The herds were grouped as high or low variability within each country, using as criterion the phenotypic standard deviation ...
Comparação de sistemas de avaliação de dietas para bovinos no modelo de produção intensiva de carne. Confinamento de tourinhos jovens
(Revista Brasileira de Zootecnia, 2002-01-01) [Artigo]
Thirty 3/4 Canchim + 1/4 Nelore young bulls with 417 kg of body weight and 15 months of age, were confined during 84 days. The animals were fed with diets composed with corn silage, corn grain, cottonseed meal, soybean ...
Estimates of direct and maternal genetic effects for weights from birth to 600 days of age in Nelore cattle
(Journal of Animal Breeding and Genetics, 2001-12-01) [Artigo]
Estimates of direct and maternal variance and heritability for weights at each week (up to 280 days of age) and month of age (up to 600 days of age) in Zebu cattle are presented. More than one million records on 200 000 ...
Estimates of covariance functions for growth of Nelore cattle applying a parametric correlation structure to model within-animal correlations
(Livestock Production Science, 2005-05-01) [Artigo]
A total of 20,065 weights recorded on 3016 Nelore animals were used to estimate covariance functions for growth from birth to 630 days of age, assuming a parametric correlation structure to model within-animal correlations. ...
Consistency of side choice in the milking parlour by holstein-friesian cows and its relationship with their reactivity and milk yield
(Applied Animal Behaviour Science, 2001-02-19) [Artigo]
Dairy cows often have to choose which of two sides to enter in the milking parlour. Some cows are very consistent in this choicė, and it is common to assume that when these cows are more disturbed are being milked in their ...
Factors that cause genotype by environment interaction and use of a multiple-trait herd-cluster model for milk yield of Holstein cattle from Brazil and Colombia
(Journal of Dairy Science, 2004-08-01) [Artigo]
Descriptive herd variables (DVHE) were used to explain genotype by environment interactions (G x E) for milk yield (MY) in Brazilian and Colombian production environments and to develop a herd-cluster model to estimate ...
Estudo de modelo alternativo para estimação de componentes de (co)variância e predição de valores genéticos de características de crescimento em bovinos da raça Nelore
(Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 2002-02-01) [Artigo]
The objectives of this study were to estimate genetic parameters for non-standardized weights at nursing (PR120), at weaning (PR240), at yearling (PR365) and at post yearling (PR550), and to predict EPD's (expected progeny ...
Genotype x environment interaction for age at first calving in Brazilian and Colombian Holsteins
(Journal of Dairy Science, 2004-08-01) [Artigo]
The objective was to determine whether there is a genotype x environment interaction for age at first calving (AFC) in Holstein cattle in Brazil and Colombia. Data included 51,239 and 25,569 first-lactation records from ...
Repeatability and heritability of response to superovulation in Holstein cows
(Theriogenology, 1999-04-15) [Artigo]
The objective of this study was to estimate the relative effects of genetic and phenotypic factors on the efficacy and efficiency of superovulation for Holstein-Friesian cows reared in Brazil. A database, established by ...